Automatic initialisation method for at least the date display, a device for performing this method and a watch equipped with said device
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United States of America Patent
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-
Apr 19, 1994
Grant Date -
N/A
app pub date -
Oct 30, 1990
filing date -
Nov 3, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The device for implementing the method for the automatic initialisation of the date display of a perpetual calendar electronic watch comprising a face fitted with a window and a date disk permits, every time the watch stops, at the moment the electronic circuit is reconnected, the automatic identification of the date appearing in the window, by optically analysing a code attributed to this date and by memorizing this data by means of the electronic circuit. This optical device (10) comprises a source (11) emitting a beam of light (12), reflective surfaces (13) fixed onto the date disk (15) and a receiver (14). The beam (16) reflected by a surface (13) is intercepted by the receiver (14) which supplies a signal to the electronic circuit (17) which controls an electronic motor (18) driving the disk (15) by a system of reduction gears (19, 20).
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